Ive got a 13" (old) a 17" (younger) and a 15" (18mnths). I prefer the 15". Ive never had an air as I like to have a cd/dvd drive. I buy lotsa music and ripping cd's to iTunes is more convenient for me. Buy as much RAM and VRAM as you can afford. btw my 13 and 17" are still as fast as the day I bought them. The 17" is my media device for my vw camper van. Its a telly, a dvd player and a hifi. Tethered with my iphone its also a mobile tinternet. Unless its apple then a laptop will be shite within a year.